# Relationship history for MSHA mine 0901039

Current hierarchy: **CRH PLC → Midsouth Aggregates → Ringgold Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Hanson PLC → Ringgold Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Ringgold Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Southeast Inc → Ringgold Quarry; 1989-07-01 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Southeast Inc; 1989-07-01 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → Ringgold Quarry; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Stoneman, Inc. → Ringgold Quarry; 2002-02-01 to 2003-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Stoneman, Inc.; 2002-02-01 to 2003-07-10; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ringgold Quarry; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Ringgold Quarry; 2003-04-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Midsouth Aggregates → Ringgold Quarry; 2003-07-11 to 2020-01-16; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Midsouth Aggregates; 2003-07-11 to 2020-01-16; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Midsouth Aggregates; 2003-07-11 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ringgold Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Ringgold Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Southeast Inc; 2007-08-23 to 2002-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Midsouth Aggregates → Ringgold Quarry; 2020-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Midsouth Aggregates; 2020-01-17 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Midsouth Aggregates; 2020-01-17 to current/open; source msha-controller-operator-history